- All sections
- D - Textilespaper
- D21H - Pulp compositionspreparation thereof not covered by subclasses , impregnating or coating of papertreatment of finished paper not covered by class or subclass paper not otherwise provided for
- D21H 23/04 - Addition to the pulpAfter-treatment of added substances in the pulp
Patent holdings for IPC class D21H 23/04
Total number of patents in this class: 228
10-year publication summary
|
18
|
12
|
15
|
22
|
16
|
23
|
12
|
20
|
16
|
8
|
| 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 |
Principal owners for this class
| Owner |
All patents
|
This class
|
|---|---|---|
| Kemira Oyj | 1197 |
43 |
| Solenis Technologies, L.P. | 331 |
18 |
| Ecolab USA Inc. | 5456 |
13 |
| Stora Enso Oyj | 1616 |
13 |
| Wetend Technologies Oy | 28 |
6 |
| UPM-Kymmene Corporation | 936 |
5 |
| GPCP IP Holdings LLC | 1642 |
5 |
| Suzano S.A. | 196 |
5 |
| SNF Group | 350 |
5 |
| Archroma IP GmbH | 459 |
4 |
| Buckman Laboratories International, Inc. | 235 |
4 |
| Daio Paper Corporation | 1383 |
4 |
| Mayr-Melnhof Karton Aktiengesellschaft | 227 |
4 |
| BASF SE | 20803 |
3 |
| Kimberly-clark Worldwide, Inc. | 5509 |
3 |
| Seiko Epson Corporation | 19281 |
3 |
| Nippon Paper Industries Co., Ltd. | 826 |
3 |
| S.p.c.m. SA | 249 |
3 |
| Daikin Industries, Ltd. | 9971 |
2 |
| Eastman Chemical Company | 2207 |
2 |
| Other owners | 80 |